/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

Promise.resolve('hello')
  .then(a => a + ' lagou')
  .then(b => b + ' I ♥ U')
  .then(c => console.log(c))


async function show() {
  let a = await Promise.resolve('helloP')
  let b = await Promise.resolve('lagou')
  let c = await Promise.resolve('IU')
  console.log(a + b + c)
}